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CO-705S Oven Controlled Crystal Oscillators (OCXO)


  • Frequencies from 1 to 25 MHz
  • Superior Aging Characteristics
  • Excellent Temperature Stabilities
  • SC/IT Cut Crystal
  • Low Phase Noise option

OCXOs - Basic Series Premium Performance
Frequency 1-25 MHz with 5 MHz and 10 MHz standard
(available 32 kHz - 25 MHz with logic output)
Temperature Stability
(Temp. Range A)
+15°C to +35°C
CO-705SA39: ±3x10-9
CO-705SA10: ±5x10-10
(Temp. Range B)
0°C to +50°C
CO-705SB59: ±5x10-9
CO-705SB19: ±1x10-9
(Temp. Range D)
-20°C to +70°C
CO-705SD18: ±1x10-8
CO-705SD39: ±3x10-9
(Temp. Range G)
-55°C to +75°C
CO-705SG28: ±2x10-8
CO-705SG59: ±5x10-9
(Temp. Range F)
-55°C to +85°C
CO-705SF38: ±3x10-8
CO-705SF18: ±1x10-8
* N/A with "L2" or "N" option
Aging 5x10-10/day (1X10-7/year)
5x10-8/year optional
at some frequencies
2x10-8/year optional
at 5 MHz
** 1x10-10/day models in 4-6.25 MHz range and at mutliples and some binary divisions of 4-6.25 MHz.
Restabilization at 25°
(freq. relative to that 2 hrs. after turn-on, following 24 hrs. off)
  Standard 15W Turn-on
1x10-7 9 min. 3 min.
3X10-8 12 min. 4 min.
1x10-8 15 min. 5 min.
Output Level >1 Vrms/ 50 (+ 13 dBm)
HCMOS/TTL optional
Supply Voltage (±5%) + 15 Vdc standard (12-24 Vdc optional);
+ 15 Vdc and 15 Vdc for HCMOS/TTL: Option "N":
+5 Vdc supply with HCMOS/TTL output available
Input Power <5 Watts at turn-on
Frequency Adjustment Mechanical adjustment settable to 1x10-8.
Option "V": Voltage tuning
Size 1.5" x 1.5" x 2", solder header studs:
SMA Output Optional
Phase Noise (typical)
(with sinwave output
4-12 MHz)
Offset Standard Option L2
10 Hz -115 dBc/Hz -130 dBc/Hz
100 Hz -140 dBc/Hz -155 dBc/Hz
1 kHz -145 dBc/Hz -163 dBc/Hz
10 kHz -148 dBc/Hz -166 dBc/Hz
50 kHz -150 dBc/Hz -168 dBc/Hz

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(solder header)

Option W
(rf output connector)

Dimensions in inches.
RF Output (N/C with Option W)
0 Volts, Case
Supply (+)
RF Return, Case
VCXO Input
VCXO Supply

*For option J, connect the +5 Vdc supply to pin 2. For HCMOS/TTL with a supply of +5Vdc only, connect the 5Vdc to both pins 2 and 4.

**Only for units with electronic tuning; otherwise, pin is No Connection. For fine tuning adjustment with the "V" option, connect one end of a 20k wirewound potentiometer to pins 7 and 3, the other wiper arm to pin 6.
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